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package rollout |
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import "hash/crc32" |
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import "math" |
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import "sort" |
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// Feature struct keeps the main information of a feature as: |
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// identification, the percentage of users that will be affected and status |
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type Feature struct { |
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Name string |
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Percentage float64 |
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Active bool |
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Whitelist []string |
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} |
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// Rollout component struct |
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type Rollout struct { |
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features map[string]Feature |
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} |
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// IsActive will check if a given user is active for a feature |
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func (r Rollout) IsActive(feature string, id string) bool { |
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1 |
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f, ok := r.features[feature] |
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1 |
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crc32q := crc32.MakeTable(0xEDB88320) |
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1 |
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crc32 := crc32.Checksum([]byte(id), crc32q) |
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return checkWhitelist(f, id) || (ok && f.Percentage > math.Mod(float64(crc32), 100)) |
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} |
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// IsFeatureActive checks if a feature is active |
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func (r Rollout) IsFeatureActive(feature string) bool { |
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f, ok := r.features[feature] |
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return ok && f.Active |
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} |
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// Activate active a feature |
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// if the feature does not exists the action is ignored |
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func (r *Rollout) Activate(feature string) { |
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f, ok := r.features[feature] |
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if ok { |
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f.Active = true |
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r.Set(f) |
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} |
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} |
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// Deactivate deactivate a feature |
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// if the feature does not exists the action is ignored |
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func (r *Rollout) Deactivate(feature string) { |
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f, ok := r.features[feature] |
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if ok { |
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f.Active = false |
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r.Set(f) |
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} |
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} |
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// Set upsert a feature inside rollout component |
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func (r *Rollout) Set(feature Feature) { |
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r.features[feature.Name] = feature |
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} |
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// Create is function used to create a new Rollout |
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func Create(features []Feature) *Rollout { |
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r := Rollout{} |
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r.features = make(map[string]Feature) |
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for _, v := range features { |
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r.features[v.Name] = v |
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} |
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return &r |
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} |
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// Get a feature by name |
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func (r Rollout) Get(feature string) (Feature, bool) { |
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f, ok := r.features[feature] |
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return f, ok |
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} |
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// GetAll get all features |
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func (r Rollout) GetAll() []Feature { |
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var features []Feature |
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for _, el := range r.features { |
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features = append(features, el) |
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} |
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sort.Slice(features, func(i, j int) bool { return features[i].Name < features[j].Name }) |
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return features |
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} |
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func checkWhitelist(feature Feature, id string) bool { |
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for _, el := range feature.Whitelist { |
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if el == id { |
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return true |
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} |
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} |
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return false |
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} |
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fbeline /
rollout
